来自德语umlaut,变音，元音变换，um-, 缩写自ambi-,两边的，周围的，-laut, 声音，词源同listen. 例，an, inch, one, unit.
英文词源
umlaut (n.)
1852, from German umlaut "change of sound," from um "about" (see ambi-) + laut "sound," from Old High German hlut (see listen). Coined 1774 by poet Friedrich Gottlieb Klopstock (1724-1803) but first used in its current sense "modification of vowels" 1819 by linguist Jakob Grimm (1785-1863).
双语例句
1. To change ( a vowel ) by umlaut.
变换元音通过元音变化改变 ( 一个元音 )
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2. To write or print ( a vowel ) with an umlaut.
标曲音符号于 ( 元音字母 )
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3. An umlaut is caused in a sound by its assimilation to another sound.